<template>
  <div class="login_container">
    <div class="login_box">
      <!--标题区域-->
      <h2>后台管理系统</h2>
      <!--登录表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form" label-width="0px">
        <!--用户名-->
        <el-form-item prop="username">
          <el-input  v-model="loginForm.username" prefix-icon="iconfont icon-yonghutianchong"></el-input>
        </el-form-item>
        <!--密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-24gl-lock2" type="password"></el-input>
        </el-form-item>
        <!--按钮-->
        <el-form-item>
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'MyLogin',
  // 这是登录表单的数据绑定对象
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        username: [
          { required: true, message: '请输入账号', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置登录表单
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        // console.log(res)
        if (res.meta.status !== 200) return this.$message.error('登录失败！')
        this.$message.success('登录成功！')
        //  1.将登录成功之后的token，保存到客户端的sessionStorage中
        // console.log(res)
        window.sessionStorage.setItem('token', res.data.token)
        //  2.项目中除了登录之外的API接口，必须在登录之后才能访问

        //  3.token 只应在当前网站打开期间生效，所有将token保存在sessionStorage中
        //  2.通过编程式导航跳转到后台主页,路由地址是/home
        this.$router.push('home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: pink;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: whitesmoke;
  border-radius: 5px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.login_form {
  position: absolute;
  left: 50%;
  transform: translate(-50%);
  bottom: 20px;
  width: 80%;
}
</style>
